Signors to the duisburger eisen- uno stahlwerke



(No Model.) A I w 0. FRIEDRICH & W. SOHULTE. APPARATUS FOR MAKINGMETALTUBES.

Patentedept. 10, 1895.

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TATES' OSCAR FRIEDRICH AND WILHELM SCHULTE, OF DUISBURG, GERMANY, AS-

SIGNORS TO THE DUISBURGER EISEN- UND STAHLWERKE, OF SAME PLACE.

APPARATUS FOR MAKING METAL TUBES.

SPECIFICATION forming part of Letters Patent No. 545,953, datedSeptember 10, 1895.

Application filed March 9, 1894. Serial No. 502,968. (No model.)Patented in England February 12, 1894, No. 3 ,038; in Austria March 14,1894, No. 44/4681; in Spain March 15,1894, No.15,528; in Italy March31,1894, No. 35,745/180; in Hungary April 19, 1894, N0. 279, andinCanada April 20, 1894, No. 45,848.

To aZZ whom it may concern.-

Be it known that we, OsOAR FRIEDRICH and WILHELM SCHULTE, subjects ofthe German Emperor, and residents of Duisburg, Kingdom of Prussia,Germany, have invented certain new and useful Improvements in Apparatusfor Making Metal Tubes and Like Articles, (which invention is thesubject of Letters Patent in Great Britain, No. 3,038, dated February12, 1894; in Canada, No. 45,848, dated April 20,1894; in Italy, No.35,745/130, dated March 31, 1894; in Spain, No. 15,528, dated March 15,1894; in Austria, No. 44/468, dated March 14, 1894, and in Hungary, No.279, dated April 19, 1894,) of which the following is a specification.

Thisinvention relates to apparatus for making seamless metal tubes ortubelike bodies with or without longitudinal ribs and of anycross-section which may be required for the purposes for which they areemployed.

The invention'aims to provide an improved apparatus for this purpose, inwhich such tubular bodies can be conveniently made from flat bands orribbons composed of two thicknessesof metal. These bands may be made inany manner and of rolled or malleable ma terial, according to theirrequired dimensions or lateral strength, but must initially havelaterally-projecting ribs.

According to our invention we provide, in combination with a mandrel,which enters between the layers of theside ribbed band to separate theselayers, rolls, or equivalent drawing or grippingdevices, for graspingthe ribs and thereby forcing the band over the mandrel. The mandrelproduces the internal shape of the resulting tube, while the rollersboth move the band by gripping its ribs and determine the external shapethereof.

In the accompanying drawings, which illustrate the preferred form of ourinvention, Figure 1 is a fragmentary longitudinal section of ourimproved apparatus. Fig. 2 is a plan View thereof. Fig. 3 is across-section of a tube partially formed thereon. Fig. 4 is a similarview of the same tube in its 'most complete form. Fig. 5 is across-section of a modi- Hat double ribbon or band; e, a guide or con-.

ducting-ram therefor; 12, a mandrel for pass ing between the folds orsides of the ribbon; and A the drawing and shaping apparatus for drawingthe ribbon over the mandrel and shaping it thereon, which apparatusconsists in this construction of flat gripping-rollers c,

slightly groovedopposite thepoint of the mandrel, and groovedshaping-rollers (Z, having grooves to correspond with the desired shapeof the resulting tube and acting on the latter opposite the widest orshaping part of the mandrel, and gripping portions grasping the ribs ofthe tube. The band a may be of any cross-section in which the band hastwo sides or thicknesses f and g, and one or more longitudinal edges orribs h, formed integral with its top and bottom sides. This band istaken from a heating or scaling furnace, or any other suitable source ofsupply, and is moved through the guide e and its end carried to thedrawing or shaping apparatus, by which it is passed over the mandrel.The mandrelb shown is constructed with a cylindrical body, having theshape'of the interior of the tube, between the final shaping-rolls cland a conical point in front of this body and between the firstgripping-rolls c. The apparatus A preferably consists of two flatrollers c on opposite sides of the point of the mandrel, having groovesof sufficient depth to permit the thickness of the sides of the band topass over the point of the mandrel, and beyond these grooves the rollershave opposed faces, which are adjusted to grip the outer flat portionsand the flanges or ribs h of the band and thereby in their rotation feedthe band toward the mandrel toward which the adjacent sides of therollers turn. In this manner the sides of the band at the outset beingseparated sufficiently to permit the entrance of the point of themandrel the band will be forced over the latter and thereby its sidesseparated as the rollers act.

The shaping-rollers d are grooved to correspond with the external shapeof the resulting tube desired, and their grooves press the separatedsides of the band against the mandrel, thus causing the interior of theband to take the shape of the corresponding part of the mandrel. Attheir sides the rollers are constructed to grip the ribs h of the band,and this action, together with their action on the remaining portion ofthe band, serves to propel the band over the mandrel.

In the construction of band shown in Fig. 1 the tube resulting will havethe cross-section shown in Fig. 3, wherein the side ribs h appear aslongitudinal ribs on the tube. It a cylindrical tube like that letteredB in Fig. 4 is desired, the ribs h are removed on the dotted lines 2 inFig. 3 and the tube is sent again over the mandrel, being turned atright angles to the position occupied during its first transit thereof,whereby it is smoothed and rendered cylindrical. In this second transit,which is the usual method of shaping tubes, the rollers c are notemployed. By the word tube herein used we intend to include all hollowstructures whether completely or but partially tubular. The inventionmay be availed of for manufacturing any such devices.

Fig. 5 shows a hollow body having two longitudinal ribs 0 O at itsopposite sides. Such a body may be drawn from a band similar inconstruction to that shown in cross-section in Fig. 6 and lettered a,which has its rib it formed externally with separated earsj. A

tube of the cross-section shown in Fig. 7 may also be formed from thisband.

Fig. 8 shows a tube having two ears D on one side only.

The band a shown in Fig. 9 has a solid headZ beyond its rib m and splitears n beyond its rib 0. A tube of the form shown in Fig. 10 may be madefrom such a band.

In carrying out our invention with our apparatus the band is drawn overthe mandrel by grasping its ribs to separate its sides and is pressedinto shape on the mandrel after such separation.

It will be seen that our invention provides an improved apparatus formanufacturing tubular bodies from fiat bands or ribbons, which can beconveniently and elfectively availed of, and it will be understood thatthe invention is not limited'to the particular details of constructionand operation set forth.

What we claim is 1. In apparatus for making metal tubes and likearticles from tube blanks having edges and an incision between theedges, a fixed mandrel having a tapering opening part and a smoothfinishing part, in combination with i gripping portions on each rollerdisposed at the sides of the mandrel, opposite thelike portions of theother roller, and beyond said grooves, engaging, shaping and grippingthe sides of the edges of the blank, propelling the latter thereby overthe mandrel, and said mandrel and rollers having between their adjacentperipheries at the plane of the axes-of the rollers an annular spacecorresponding to the desired cross-section of the tube and its edges,substantially as and for the purpose set forth.

2. In apparatus for making metal tubes or like articles from tube blankshaving edges and an incision between the edges, a fixed mandrel havingan opening point entering and separating the blank, and a subsequentfinishing portion finishing the interior of the tube, and two pairs ofdriving rollers oppo site said mandrel, the one pair opposite theopening end of the mandrel and the other pair opposite the finishingportion thereof, the first pair having shallow grooves rolling the tubeagainst the mandrel, and having the shape of the sides of the tubebetween its edges as it enters the mandrel, and the sec ond pair havingdeep shaping grooves finishing and shaping the outside of the tubeopposite the finishing portion of the mandrel, and having the shape ofthe exterior of the finished tube between its edges, and each of saidrollers having gripping portions at the opposite sides of and beyondsaid grooves, spaced apart and receiving and gripping the edges of thetube between them, said rollers turning in the direction of travel ofthe tube, driving it over the mandrel, and simultaneously shaping it,substantially as and for the purpose set forth.

3. In apparatus for making metal tubes or like articles from tube blankshaving edges and an incision between the edges, a fixed mandrel I)having a conical point and a cylindrical finishing part, in combinationwith two driven rollers copposite said mandrel, having concave groovesparallel with the axis thereof, and cylindrical gripping portions at thesides of said grooves, said rollers and mandrel disposed with a spacebetween them corresponding to the cross sectional shape of the blank asit passes on the mandrel, and said gripping portions separated with aspace between them corresponding to the thickness of the edges of theblank, gripping these flanges and thereby propelling the blank overflanges of the tube to be rolled and gripping these flanges and therebypropelling the tube.

In witness whereof we have hereunto signed our names in the presence oftwo subscribing I 5 witnesses.

OSCAR FRIEDRICH. VVILHELM SOHULTE.

Witnesses:

AIJBERT KLINGHAMMER, WILHELM BR'UGGEMANN.

